Telephone receiver



June 9, 1931. FRENCH 1,869,749

TELEPHONE RECEIVER Filed April 10, 1930 INVENTOR ITNESSES Geor e B.F'r en0fi 1 ATTORNEYS Patented June 9, 1931 UNITED Y STATES PATENT OFFICE TELEPHONE RECEIVER Application filed April 10,

This invention relates to telephone receivers.

It is among the objects of the present invention to provide a novel and improved telephone receiver which will faithfully reproduce vibrations in response to the voice currents imposed upon the magnets thereof.

A further object of the present invention is to provide in a telephone receiver, a, closed air chamber between the normal diaphragm and the inner face of the cap or cover, whereby vibrations of the diaphragm are faithfully transmitted to the cap or cover. I

The present invention is particularly adapted for use as a receiver operating on the well-known bone transmission theory of sound. In accordance with said theory, the receiver may be held or secured against any portion of the bony structure of the head and vibrations will thus be molecularly transmitted through the bone to the labyrinthine fluid of the ear. Such devices are particularly adapted for use in overcoming deafness and are valuable in'aeroplane telephonic communication systems or equivalent places where the normal noise is such as to prevent properreception of sound waves from the conventional receiver now in use.

Further objects of the present invention are to provide means to directly vibrate a receiver cap or cover in response to voice currents, together with the provision of a device which is simple in construction and operation and particularly adapted to meet the demands of economic manufacture.

Other objects and features of the present invention will be apparent from a consideration of the following specification taken in conjunction with the accompanying drawings, in which Figure 1 is a perspective view of one form of the present invention, and

Fig. 2 is a transverse section through that form of the invention shown in vFig. 1.

5 Referring more particularly to the drawings, it will be seen that the form of the device here shown by way of illustration, includes the conventional casing 10, which may be formed of any desired material. J The invention is not limited to any particular con- 1930. Serial No. 443,153.

struction, and various types of casings with electromagnet assemblies therein may be used without departing from the spirit or scope of the invention. The forward edge of the open side of the casing 10 is externally threaded as at 11, in conventional manner and receives thereover in threaded connection, a cover 12 of solid construction, herein illustrated as being formed of hard rubber or equivalent material. It will be particu- 30 larly noted that the cover 12 is formed without the usual aperture and conforms with the casing 10 to provide an airtight union therebetween. v I

Within the casing 10, any conventional 5 type of electromagnetic assembly may be provided. The assembly here illustrated is generally indicated by the numeral 13 and is understood to represent any one of various modifications of such assemblies which may be utilized. Secured between the casing 10 and the cover 12, there is provided a diaphragm 141 which extends across the open end of the casing in magnetic relation to the poles of the assembly 13,. whereby magnetic energization thereof in response to voice currents applied to the assembly will vibrate the diaphragm 14 in accordancetherewith.

. The assembly will readily-be seen to be suchrthat a confined air space 15 is provided 3 between the front face of the diaphragni and the inner face of the cover 12. The cover l2 being joined in airtight association with the casing 10 and being solid without the provision of the usual aperture or.aper tures therethrough, provides for the. directtransmission of vibrations from the flexible diaphragm to the cover 12. In the present instance, it is preferable to have the air in the space 15 at substantially atmospheric pressure. It will be understood, however, that variations of-such pressure will provide for variations in the response of the outer c'asing to the vibrations-of the diaphragm 14. Thus the pressure may be arranged to utilize the normal compressibility of the air at a predetermined pressure to vary the vibrations of the cover in response to the vibrations of the diaphragm.

The structure of the cover is preferably y-.00

such that vibrations of the whole cover including the sides thereof, will be in response to the vibrations of the diaphragm 14,-. The arrangement may obviously be such that only the flat front face of the diaphragm will vibrate should such an arrangement be desired.

From the foregoing it will readily be seen that the invention provides a novel, simple and improved receiver, which is not confined to the limitations of the structural presentation thereof herein made. Various changes, modifications and the full use of equivalents are contemplated to be within the scope of the appended claims.

What is claimed is:

1. A receiver of the class described, including a casing, a cover associated with said casing, a diaphragm Within said casing, means for vibrating said diaphragm in response to voice currents, and said diaphragm and said cover forming a closed air space.

2. In a telephone receiver, a flexible diaphragm adapted to be vibrated in response to voice currents, and a solid cover assoc1- ated therewith, said cover and diaphragm forming a closed air space therebetween, whereby vibrations of said diaphragm will be conducted through the closed air space to said cover.

3. In a device of the character described, a casing, a cover receivable over said casing in airti ht relation, a diaphragm secured Within saig? casing by said cover, and said cover and diaphragm forming a closed air space, adapted to transmit vibrations of said diaphragm to said cover.

4. In a telephone receiver, a casing having a resonant cover, a diaphragm held in place by said casing and cover and adapted to be vibrated in response to voice currents, means secured to and arranged within the casing adjacent the diaphragm for vibrating said diaphragm in response to voice currents, said diaphragm and cover forming a closed chamber, and said chamber having a fluid medium therein for conducting vibrations from said dia hragm to said cover.

Signed at ew York city in the county of New York and State of New York this 7th day of April, A. D. 1930.

GEORGE B. FRENCH. 

